Australian Monitor AMIS250 Mixer Amplifier

Description
The AMIS250 is a 6 channel, 250 watt mixer amplifier suitable for rack or desk mounting. The amplifier is a self contained compact unit of solid steel construction.

Inputs
The AMIS250 has six universal input channels with separate level controls. Each channel will accept balanced or unbalanced microphone, line and auxiliary inputs. The unit has industry standard XLR microphone sockets and dual RCA auxiliary sockets for each channel. An electronically-balanced 600 ohm telephone input for paging is also provided. An insert point is also featured on the rear panel for those applications where an additional EQ or feedback exterminator may be required.

Outputs
The AMIS250 features 70 volt and 4 ohm isolated transformer outputs, plus a tape recorder output by means of dual RCA sockets. A balanced 700mV XLR output is also provided to feed up to 6 power amplifiers.

Tone Generator
The AMIS250 comes standard with an in-built four tone generator module. Tones include Bell, Pre-announce Chime, Alert Tone and Evacuate Tone. Any of these tones may be activated from a simple contact closure on the rear panel of the amplifier.

Muting
VOX muting is standard on the AMIS250. A mic or line signal on channels 1 or 2 will mute channels 3, 4, 5 and 6. The muting function can be disabled via an internal link.
Phantom Power
Phantom Power (18V DC) is available from all mic inputs. A rear panel phantom power on/off switch is also provided.

Protection
Internal current limiting protects the amplifier from both overload and overdrive conditions. Australian Monitor Installation Series amplifiers feature a protection network that provides greater stability and performance. Our amplifiers are recognised worldwide for their reliability and this is due to the extensive levels of current limiting which protect the amplifiers from both overload and overdrive conditions.

AMIS250 Specifications

• Power Output 250 watts RMS
• Maximum Load 20 Ohms @ 70 Volts
• Power Bandwidth 60Hz - 17kHz (- 3dB)
• Frequency Response 60Hz - 23kHz (- 3dB)
• Total Harmonic Distortion 0.5% @ 1kHz rated power
• Signal To Noise Ratio -74dB with all controls at their centre position
• Tone Controls Bass @ 100Hz: Boost +12dB Cut -12dB; Mid @ 600Hz: Boost +12dB, Cut -12dB; Treble @ 10kHz: Boost +9dB Cut -9dB
• Inputs Six mic/aux universal inputs with XLR female mic sockets and dual RCA Phono aux sockets; 600 ohm transformer balanced telephone paging input
• Input Sensitivity Mics: 1mV @ 200 Ohms; Aux: 150mV @ 47K Ohms Outputs Speaker: 70 Volts, 4 Ohms; Tape: 350mV @ 10K Ohms; Line: Balanced 700mV
• Phantom Power 18 Volts DC on all Mic inputs
• Controls 6 Input channel gain controls, 1 Bass control, 1 Mid Control, 1 Treble control, 1 Master gain control, Phantom Power on/off switch (on rear panel)
• Indicators Power "on" and "Protect" LED
• Power Source 120VAC 60Hz 3 pin IEC connector; 24VDC
• Power Consumption 400 Watts
• Protection Current Limiter protection, plus AC and DC fuses
• Dimensions/Weight 3.5" H x 19" W x 13" D (Chassis Dimensions only). 33.1lb
• Rack Mounting Standard
• Tone Generators Built-in four tone generator module. Includes Bell, Pre-Announce, Alert and Evac Tones
• Muting Built-in VOX muting. Channels 1 and 2 will mute channels 3, 4, 5 and 6

Architectural and Engineering Specifications
The mixer amplifier shall have six universal inputs each comprising of a balanced microphone with XLR female sockets and an auxiliary input using dual RCA sockets. A balanced XLR output to drive additional power amplifiers shall also be provided. The amplifier master section shall include one master gain control, three EQ controls, one with 12dB of cut and boost at 100Hz, one with 12dB cut and boost at 600Hz and the other with 9dB of cut and boost at 10kHz. Speaker outputs shall be transformer isolated at 70 volt and 4 ohms. The amplifier must be capable of delivering 250 watts RMS into a 20 inductive ohm load, with less than 0.5% distortion measured at 1kHz and with system hum and noise less than -74dB. The amplifier shall be an Australian Monitor Installation Series model AMIS250.